Table 4 Modeling of the BrainLAB imaging couch top (ICT) in the Philips Pinnacle 3 treatment planning system using different combinations of carbon fibers (CF) and foam densities (F) for 5 cm × 5 cm field size
Percentage Deviation of the Treatment Planning System Predicted Dose to Measured Dose | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Angle | Measured Dose (cGy) | No Couch | CF0.6 | CF0.5 | CF0.46, | CF0.46 | CF0.6 | CF0.55 | CF0.7 |
F0.02 | F0.03 | F0.5 | F0.1 | F0.1 | F0.03 | F0.1 | |||
180 | 81.2 | 1.84 | -0.99 | -0.13 | -0.75 | -1.86 | -2.96 | -0.50 | -3.21 |
170 | 80.8 | 1.80 | -1.04 | -0.30 | -0.92 | -1.91 | -3.02 | -0.67 | -3.39 |
160 | 79.7 | 2.19 | -0.94 | -0.07 | -0.82 | -1.82 | -2.95 | -0.57 | -3.33 |
150 | 77.5 | 2.71 | -0.39 | 0.51 | -0.26 | -1.55 | -2.71 | 0.13 | -3.10 |
140 | 74.0 | 3.66 | -0.40 | 0.68 | -0.13 | -1.62 | -3.10 | 0.14 | -3.51 |
130 | 68.3 | 5.24 | 0.12 | 1.29 | 0.26 | -1.35 | -3.10 | 0.70 | -3.69 |
120 | 59.2 | 7.90 | 1.14 | 2.66 | 1.31 | -0.88 | -3.08 | 1.82 | -3.75 |
110 | 50.0 | 6.51 | -1.28 | 0.52 | -0.08 | -1.28 | -3.68 | -0.48 | -4.48 |
100 | 56.0 | -1.15 | -1.15 | -1.15 | -1.15 | -1.15 | -1.15 | -1.15 | -1.15 |
sum | 30.69 | -4.95 | 4.01 | -2.54 | -13.42 | -25.77 | -0.59 | -29.62 | |
t-test | 0.002 | 0.047 | 0.23 | 0.21 | 0.00004 | 0.000005 | 0.76 | 0.000005 | |